Electric-wire-wound hemisphere



July 21, 1925,

M. M. WOOD ELECTRIC-WIRE WOUND HEMISPHERE Filed May 7, 1921 2 h ts-Sheet1 July 21, 1925. 1,546,424

M. M. WOOD ELECTRIC WIRE WOUND HEMISPHERE Filed May '7, 1921 2Sheets-Sheet 2 Patented Jul 21, 1925. v

' UNITED STATES 1,546,424 PATENT OFFICE.

moN'rRAv'rLLE M. woon, or BERWYN, ILLINOIS; CARRIE r. wooD EXECUTRIX orv SAID MONTRAVILLE M. wooD, DECEASED.

Application filed Kay 7, 1921. Serial No. 467,662.

To all whom it may concern:

Be itknown that I, MONTRAVILLE M. \VooD, a citizen of the United States,residingat Berwyn, in the county of Cook and State of Illinois, haveinvented a certain new and useful Improvement in Electric- VVire-VoundHemispheres, of which the following is a specification;

In various arts, among them that of wireless telegraphy there aremechanisms which require coils of electric current carrying wire, to bewound to conform in curvature to a hemisphere. The object ofthisinvention is to provide a device of this kind'xin an easy andeconomical manner, which. is for the purposes of its use accurate inconstruction, and not liable to' get out of order. The inventionconsists in mechanism for attaining the foregoing objects and in otherspecial features and details of construction hereafter more fully .setforth in the specification and claims.

Referring to the drawings in which like numerals denote. like partsthruout the several views,

Figure 1 is a plan, and

Figure 2 is a side view of a completed structure illustrating thisinvention in its preferred form.

Figure 3 is a plan view of the frame or carrier used to more or lesspermanently supportthe wire in the hemisphere illustrating thisinvention.

Figure 4 shows two hemispheres of Figure 2 assembled in a completesphere.

In constructing the hemisphere of this invention a sheet of more or lessrigid, yet bendable material, such as paper is provided, preferencebeing given however, to a material which can be dissolved from the wiresof the finished hemisphere by the use of a suitable solvent. This sheetof paper or other light material is first layed out flat as shown inFigure 3, a central portion 10 marked ofi" and about this center radialV- shaped notches 12 are cut so as to leave an odd number of generallytriangular slightly bell shaped spokes 14 extending outwardly from thecenter 10. The widths of the notches 12 should be such that when thecenter member 10 is supported and .the

spokes 14 are bent downward, as vlewed in Figure 2, (or upward if thedevice is reversed) what is practically a hemisphere of paper or-likematerial is formed with narby circumferentially winding the device withwire 16. In doing this the operator begins at a suitable point as 18 atthe air-- cumfere-nce of the central portion 10, and winds around thatcenter in circles carry- 1ng the wire under and over alternate spokes 14at each radial V-shaped opening 12 just draws the wire tight BIlOlTgh sothat when the final convolutions 16 of the wire are put on, the entirehemispherical structure is as is done in basket makin and in so doingrigidly held in position, as shown in Fig- 7 ure 2.

For purposes of supporting the hemisphere in the operation ofconstruction or otherwise, the radial spokes 14 may be left with endportions 20, tapered if desired, as shown extending beyond the generalcircumference formed by the ends of the. other spokes so that these endportions actas supporting legs carrying the partially or wholly completehemisphere up a slight distance above a table or other support. Theseend portions 20 are also of assistance for fastening purposes when twohemispheres of this invention are to be put together to make a completesphere or an approximation thereto as shown in Figure 4 wherein theparts 20 of opposing hemispheres are overlapped and secured together byany sort of conventional fastening means as rivets 22.

One embodiment of the invention contemplates the leaving of thestructure as shown in Figure 2, with the framework 1014 acting as asupport for the basket 1 like wire structure 16. In such a case thesupport should be preferably but not necessarily of insulating material.

In another embodiment of the invention the structure of Figure 2 may beimmersed in a solution which will dissolve out the support 10-14 andleave the wire structure 16. In either case a suitable liquid,

such as shellac may if desired be applied to the wires to dry and set inthe well. known manner and hold the wires in place after said liquiddries. This is not at all necessary when the framework 1014 is left inthe wire hemisphere. I I

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is

1. An inductancecoil comprising a core of hemi-spherical shape composedof a plurality of arms radiating from a common point in said core, andwire wound over and under said arms.

2. An inductance coil comprising a core of spherical contour composed ofa plurality of arms radiating from a common point in said core, and wirewound-over and under said arms.

3. The method of determining the contour of electrical coils whichconsists in Winding wire on a normally flat pliable core with sufiicienttension to progressively impart to the core and its associated coil arounded contour.

'4. The method of determining the contour of electrical coils whichconsists in winding wire over and under radiating arms of a normallyflat pliable core with sufl'icient tension to progresslvely impart tosaid arms and their associated'coil a rounded contour.

5. A method of makingan' nductance coil which consists in winding askeleton hemispherical support with'a series of convolutions of wireextending in and out of the support, and subsequently assembling andconnecting two such pre-wound supports to forma completed hollowspherical coil.

6. A variometer inductance coil comprisnesses.

MONTRAVILLE M. WOOD. Witnesses:

DWIGHT B. GHEEVER, VEIMA GRIFFITH.

